スタンプを回転させる

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<!DOCTYPE html> <html lang="ja"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>スタンプの回転</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" href="./src/styles.css"> <script src="/diodocs/pdfviewer/demos/product-bundles/build/dspdfviewer.js"></script> <script src="/diodocs/pdfviewer/demos/product-bundles/build/wasmSupportApi.js"></script> <script src="/diodocs/pdfviewer/demos/resource/js/init.js"></script> <script src="./src/app.js"></script> </head> <body> <div id="viewer"></div> </body> </html>
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